IWT based Reversible Data Hiding in Encrypted Domain using location map

The idea of reversible data hiding in encrypted images allows lossless data obscuring and data security. The exact retrieval of both the hidden message and the host image is crucial in this approach. In transform domain, there is some loss of information, not acceptable in most of the sensitive areas. Affine wavelet transformations that delineate integers to integers have significant role in such applications of reversible data hiding. This article presents a new reversible data hiding technique in the encrypted domain utilizing the integer wavelet transform (IWT) for grayscale images. The proposed work first encrypts the images using random permutation method and then perform embedding by utilizing IWT. For data embedding, encrypted images are decomposed into four sub-bands by applying IWT. Various experimentation has been done using standard grayscale images. Results and comparison with recent works show the efficacy of proposed work.